Include a link to the wiki about contributing code to Archi, for easy
reference from GitHub.
Make structural chain documentation clearer.

Clarify the documentation for structural chains: at least two
relations to make up a chain.
Move a section forward to make the content present it self in a slightly more
"sequential reading" friendly way.
[Unit Tests] Check for null
[magwas] Ubuntu Shell scripts combined into one script

* Provided by magwas (mag@magwas.rulez.org)
[SVG Export] Add Preferences Initialiser

* Add Preference Initialiser the "Eclipse" way
* One Unit Test was failing the old way
[Code Refactor] Use single recursive methods

* Let's be smarter about this, ok?
Merge PR #49
Merge PR #50 and edits

* Some additional edits nade